If you are trying to improve efficiency in the office, at home with the kids, at the gym, and overall in your life in general, the key is to relax, and to do things at the proper pace. When you are rushing through things, and trying to get through something in a hurry, you are not only going to do it incorrectly, you are going to find that the end result is not something that you are going to be proud of. From a report you have to turn in for your boss, to a draft you have to submit to a client, when you do things right, when you relax, and when you take the time to do it right, you are going to find that the end result is going to be much better when you do have to turn it in to the boss or to the new client.
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When you use relaxation and breathing techniques, you are going to find it much easier to concentrate. Not only is air and oxygen going to flow in to the brain and the rest of the body freely, but when you are breathing and working at the right pace, as opposed to trying to rush through something, you are going to pay attention to detail in the things that you are doing. So, you are going to find that you will see the minor detail that you may have missed if you were in a hurry, or you are going to see the big error in the report that you are trying to complete by a deadline, when you look over it, and edit it properly, rather than simply rush through it and try to hand it in, in the quickest time possible.
When you are under stress to perform well, you are going to feel as if you are under a strict time crunch; even if you are, you have to use proper breathing and mental image techniques, so that you can relax and prepare the body to work well and to work efficiently, through any task that you are trying to complete. There are quite a few restrictions you are going to deal with when you are not getting sufficient oxygen to the brain. So, you do have to make sure you are taking deep, and concentrated breaths, as opposed to shallow breathing, which is going to restrict the air that goes to your brain, in turn, creating poor quality work when you are ready to turn something in.
Although it might take you a little longer to complete a task, in many situations it is really going to cut the time, since you are not going to have to edit, and do the work over. When you take your time, breath, and work at an efficient pace; rather than try to rush through, and just jump to a conclusion, you are going to find that the final product, with everything you do, is going to come out much better.